In order to edit lock details you first have to choose a lock in the menu Locks. Now you have several option you can choose:
B) The tab Access shows you all the users having access to this specific lock.
C) If you want to grant access for new or existing contacts, just press the + button. For more detailed explanation, click here.
D) The category info shows you all relevant lock-specific information, e.g. the serial number.
E) You can have a look at the access log here as well. You can see all the closing processes and can understand who has had access to a particular room and when.